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REGULATORY MATTERS (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
REGULATORY MATTERS        
Number of ratios calculated according to the regulations for determining assigned capital category 3msfg_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsNumberOfRatios      
Number of categories defined in the regulations, ranging from well capitalized to critically undercapitalized 5msfg_NumberOfCategoriesDefinedInRegulations      
Total capital (to risk-weighted assets)        
Actual, Amount $ 332,726us-gaap_Capital $ 302,181us-gaap_Capital    
Required for Adequate Capital, Amount 165,975us-gaap_CapitalRequiredForCapitalAdequacy 145,150us-gaap_CapitalRequiredForCapitalAdequacy    
Actual, Ratio 16.00%us-gaap_CapitalToRiskWeightedAssets 16.70%us-gaap_CapitalToRiskWeightedAssets    
Required for Adequate Capital, Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets    
Tier 1 capital (to risk-weighted assets)        
Actual, Amount 309,476us-gaap_TierOneRiskBasedCapital 279,440us-gaap_TierOneRiskBasedCapital    
Required for Adequate Capital, Amount 82,988us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy 72,575us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy    
Actual, Ratio 14.90%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 15.40%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets    
Required for Adequate Capital, Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets    
Tier 1 capital (to average assets)        
Actual, Amount 309,476us-gaap_TierOneLeverageCapital 279,440us-gaap_TierOneLeverageCapital    
Required for Adequate Capital, Amount 121,014us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy 110,428us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy    
Actual, Ratio (as a percent) 10.20%us-gaap_TierOneLeverageCapitalToAverageAssets 10.10%us-gaap_TierOneLeverageCapitalToAverageAssets    
Required for Adequate Capital, Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets    
Cash 62,485us-gaap_CashAndCashEquivalentsAtCarryingValue 61,320us-gaap_CashAndCashEquivalentsAtCarryingValue 65,650us-gaap_CashAndCashEquivalentsAtCarryingValue 109,148us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company        
Tier 1 capital (to average assets)        
Cash 6,322us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
11,667us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
7,102us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8,022us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
MainSource Bank        
Total capital (to risk-weighted assets)        
Actual, Amount 321,005us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
283,653us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Required for Adequate Capital, Amount 164,648us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
144,147us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
To Be Well Capitalized, Amount 205,810us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
180,184us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Actual, Ratio 15.60%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
15.70%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Required for Adequate Capital, Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
To Be Well Capitalized, Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Tier 1 capital (to risk-weighted assets)        
Actual, Amount 297,755us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
261,069us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Required for Adequate Capital, Amount 82,324us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
72,074us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
To Be Well Capitalized, Amount 123,486us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
108,111us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Actual, Ratio 14.50%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
14.50%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Required for Adequate Capital, Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
To Be Well Capitalized, Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Tier 1 capital (to average assets)        
Actual, Amount 297,755us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
261,069us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Required for Adequate Capital, Amount 119,880us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
109,090us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
To Be Well Capitalized, Amount $ 149,850us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 136,363us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Actual, Ratio (as a percent) 9.90%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
9.60%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Required for Adequate Capital, Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
To Be Well Capitalized, Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember